Hot-air heating furnace



- May 1, 1928.

J. REGAN no'r AIR HEATING FURNACE Filed Feb. '7, 1927 Ill/ll!!! I IV 7/1 111/ Ma llllll IV Patented May 1, 1928.

UNITED s rariezs JOHN BEGAN, or vanconvaaf BRITISH COLUMBIA, CANADA.

nor-Ara HEATING summon.

Application filed February 7, 1927. Serial No. 166,556,

My invention relates to improvements in hot air heating furnaces the'objects of which are to provide means whereby a large volume of air is heated by direct contact withthe 6 surfaces of the fire dome and the radiator. The air heating spaces are divided into se'pa rate chambers each having cold air inlets and hot air outlets, so thatthe air inente'ring either of the casings mayabsorb from the fire such heat as is required and pass outward therefrom before it has'beco'me unduly hot and unfit for heatingandventilab ing purposes. In furnaces of regular construction much heat is usually lost through the short length of the smoke passages, Whereas in this invention this objection is overcome and the smoke passages generally are vertically disposed so that soot does not become deposited thereon and the thermal effect of the fuel used is transmitted to the air spaces of the casing with very little loss. The invention consists essentially of a furnace having a central dome surrounded by a plurality of vertical smoke passages which communicate with the smoke outlet through a smoke header, and a pair of superimposed air heating spaces confined'by an outer casing, which will be more fully described in the following specification, in

which 2- Fig. 1 is a vertical sectional view taken on the line 11 of Figure 2.

Fig. 2 is a plan view taken on the line 22 of Figure 1.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numeral 1 indicates a furnace base having an ash pit door 2 hingingly mounted thereon. The numeral 3 indicates an ash pit above which a grate 4: is supported. Extending from the marginal edges of the grate 4 is a fire area 5 which is substantially horizontal and extends outwards to a fire pot casting generally indicated by the nunieral 6. The fire pot casting is provided with a hinged fire door 7 and is surmounted with an internal annular flange 8 supporting a cylindrical dome 9 having a top closure 10 and a radiator generally indicated by the numeral 11. Flange 8 terminates at its inher edge in a collar 8 fitting within the lower end of the dome. The radiator 11 consists of a plurality of vertical tubes communicating at their lower extremities with the flange 8 of the fire pot 6 and at their up per extremities with a smoke drum 12 havsmoke pipe 16 leading toa suitablesmoke stack.

" The numeral 17 indicates a furnace casing mounted upon the base 1 and having a top'closure 18 which is preferably recessed below the upper extremity of the casing walls to provide a receptacle for a suitable insulating material to prevent the wastage of heat thei'ethrough. The casing 17 is divided intermediate its height with a plate 19 "to define an upper and a lower-warm air chamber respectively indicated by the numerals 20 and 21. The numeral 22 indicates a plurality of cold air return pipes leading to the lower portion of the lower warm air chamber 21 through branches 23 and to the lower portion of the upper warm air chamher 20 through one or 1110112 branches 24,

which branches would preferably be fitted with control dampers 25.

'The numeral 26 indicates a plurality of warm air ducts leading from the chamber 21 to some of the rooms of the building, and 27 indicates a plurality of warm air ducts leading from the chamber 20 to the same or other portions of the building.

Having thus described the several parts of my invention I will now briefly explain its function.

The heat from the fire within the fire pot rises vertically into the dome 9, striking the top closure 10 thereof, whence it flows in a downward direction as shown, passing under the annular flange 8 and entering the tubes of the radiator 11 through which is passes upwards into the drum 12 where it assumes a horizontal direction, finally flowing outwards through the outlet 15 and the smoke pipe 16 into the smoke stack. The primary heat from the fire is utilized to raise the temperature of the air flowing through the cold air branches 23 around the fire pot 6, the lower portions of the radiator tubes 11 and the dome 9 and outwards from the lower chamber 21 through the warm air ducts 26. The secondary heat from the fire is utilized to warm the air passing through the branches 24 through the upper warm air chamber 20 to the ducts 27 by contacting with the outer surfaces of the upper extremities of the radiator tubes 11 and the drum 12. By arranging the dome so that the products of combustion must pass outwards therefrom under its lower rim, the smoke travel will first extend to the to of the dome, and then travel downwards a ong its side walls so that they will be evenly heated and the danger of expansion cracks are avoided.

It will thus be seen that I have invented a furnace in which the air to be heated is brought into contact with considerably more heating surface than is usual in furnaces of regular construction.

What I claim as my invention is: p A hot air furnace structure comprising a base member equipped with a grate and an ash pit underlying said grate, a furnace casing closed at its u per end and havin its lower end mounted on the base, a llOIlzontal partition extending across and di viding the casing into up er and lower warm air chambers, each of said chambers having a warm air outlet in the u per. portion thereof and a cold air inlet in the lower portion thereof, a fire pot presenting an anof the tubes secured to the flange of the fire pot and communicating with the interior of the latter, a smoke drum carried by the upper ends of the tubes and communicating therewith, said drum being spaced below the u (per end of the furnace casing and proa v1 ed with a smoke outlet extending through V a wall rtion of said casing. Date at Vancouver, B. 0., this 2nd day of February, 1927.

JOHN REGAN. 

